(19)
(11) EP 0 342 899 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.05.1990 Bulletin 1990/20

(43) Date of publication A2:
23.11.1989 Bulletin 1989/47

(21) Application number: 89304889.2

(22) Date of filing: 15.05.1989
(51) International Patent Classification (IPC)4: F24F 13/00, F24F 7/08, F04D 29/66, F24F 7/007
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 17.05.1988 GB 8811603

(71) Applicant: DIFFUSION ENVIRONMENTAL SYSTEMS LIMITED
East Molesey Surrey (GB)

(72) Inventors:
  • Howard, David Arthur
    Leatherhead Surrey KT22 8PR (GB)
  • Grimmer, Peter Roy
    Shepperton Middlesex (GB)

(74) Representative: Beresford, Keith Denis Lewis et al
BERESFORD & Co. 2-5 Warwick Court High Holborn
London WC1R 5DJ
London WC1R 5DJ (GB)


(56) References cited: : 
   
       


    (54) Acoustic fresh air ventilator


    (57) An acoustic fresh air ventilator is formed in a box (1) in which one or more fans (8, 10) are located. The box is designed to be mounted to a wall (5) with an inlet and/or outlet ducting element (42, 44) extending from the box through the wall. The ducting elements are so arranged as to occupy a minimal space for reducing the size of the hole (70). The box is packed with acoustic packing materials suitably in pieces or bags (30, 32, 36, 38, 40). Conduits (20, 22, 24, 26) between the fan(s) and box sides are preferably formed by the packing material. The fan(s) is/are held in free floating suspension in the acoustic material.







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